A first rapid synoptic magnetic field map using SDO/HMI and SO/PHI data
Schmidt, W.; Woch, J.; Solanki, S. K.; Schou, J.; Fiethe, B.; Bellot Rubio, L. R.; Appourchaux, T.; Valori, G.; Germerott, D.; Schühle, U.; Heerlein, K.; del Toro Iniesta, J. C.; Gizon, L.; Calchetti, D.; Moreno Vacas, A.; Hirzberger, J.; Albert, K.; Albelo Jorge, N.; Blanco Rodríguez, J.; Feller, A.; Gandorfer, A.; García Parejo, P.; Guerrero, L.; Gutierrez-Marques, P.; Kahil, F.; Kolleck, M.; Korpi-Lagg, A.; Orozco Suárez, D.; Pérez-Grande, I.; Sanchis Kilders, E.; Sinjan, J.; Staub, J.; Strecker, H.; Volkmer, R.; Loeschl, P.; Alvarez-Herrero, A.; Balaguer Jiménez, M.; Carmona, M.; Deutsch, W.; Fernández-Medina, A.; Grauf, B.; Lange, T.; López Jiménez, A.; Maue, T.; Meller, R.; Müller, R.; Nakai, E.; Torralbo, I.; Fernandez-Rico, G.; Gasent Blesa, J. L.
Germany, Spain, France
Abstract
Context. Traditionally, the observation time needed to build synoptic maps of the solar magnetic field is bound to the 27 days of a full Carrington rotation due to the single viewpoint from Earth.
Aims: Our aim is to reduce this observation time to 13.5 days by combining magnetograms from two vantage points, 180° apart in longitude in the ideal case.
Methods: We combined observations taken by the Polarimetric and Helioseismic Imager (SO/PHI) during the superior conjunction of the Solar Orbiter in February 2021 with data from the Helioseismic and Magnetic Imager (SDO/HMI) and constructed a synoptic map of the line-of-sight magnetic field of CR 2240. Resuls. The result is the first multi-view synoptic map using SDO/HMI and SO/PHI data from an observing period of only 16 days. Comparing the multi-view synoptic map to the standard synoptic map of SDO/HMI shows a significant amount of magnetic evolution between the dates on which the two instruments observed the same solar longitudes. The changed magnetic field was caught by the multi-view synoptic map but would have been missed by a standard synoptic map.
Conclusions: Our results demonstrate that multi-view synoptic maps provide a new method to obtain a more instantaneous map of the magnetic field over the entire solar surface.